feat: list semver tags

go.mod

@@ -3,6 +3,7 @@ module github.com/haunt98/changeloguru
 go 1.18
 
 require (
+	github.com/Masterminds/semver/v3 v3.2.1
 	github.com/go-git/go-git/v5 v5.7.0
 	github.com/make-go-great/color-go v0.4.1
 	github.com/make-go-great/date-go v0.5.0

go.sum

@@ -1,3 +1,5 @@
+github.com/Masterminds/semver/v3 v3.2.1 h1:RN9w6+7QoMeJVGyfmbcgs28Br8cvmnucEXnY0rYXWg0=
+github.com/Masterminds/semver/v3 v3.2.1/go.mod h1:qvl/7zhW3nngYb5+80sSMF+FG2BjYrf8m9wsX0PNOMQ=
 github.com/Microsoft/go-winio v0.5.2 h1:a9IhgEQBCUEk6QCdml9CiJGhAws+YwffDHEMp1VMrpA=
 github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
 github.com/ProtonMail/go-crypto v0.0.0-20230518184743-7afd39499903 h1:ZK3C5DtzV2nVAQTx5S5jQvMeDqWtD1By5mOoyY/xJek=

internal/git/example/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"log"
+
+	"github.com/haunt98/changeloguru/internal/git"
+)
+
+func main() {
+	r, err := git.NewRepository(".")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	commits, err := r.Log("", "")
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Commits: ", commits)
+
+	tags, err := r.SemVerTags()
+	if err != nil {
+		log.Fatal(err)
+	}
+	log.Println("Tags: ", tags)
+}

internal/git/models.go

@@ -0,0 +1,28 @@
+package git
+
+import (
+	"github.com/Masterminds/semver/v3"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+// Commit stores all git-commit information
+type Commit struct {
+	Author  Author
+	Message string
+}
+
+// Convert from go-git
+func newCommit(c *object.Commit) Commit {
+	return Commit{
+		Message: c.Message,
+		Author: Author{
+			Name:  c.Author.Name,
+			Email: c.Author.Email,
+			When:  c.Author.When,
+		},
+	}
+}
+
+type SemVerTag struct {
+	Version *semver.Version
+}

internal/git/repository.go

@@ -2,7 +2,9 @@ package git
 
 import (
 	"fmt"
+	"sort"
 
+	"github.com/Masterminds/semver/v3"
 	"github.com/go-git/go-git/v5"
 	"github.com/go-git/go-git/v5/plumbing"
 	"github.com/go-git/go-git/v5/plumbing/object"
@@ -12,13 +14,15 @@ import (
 const (
 	head = "HEAD"
 
-	defaultCommitCount = 10
+	defaultCommitCount = 128
+	defaultTagCount    = 32
 )
 
 // Repository is an abstraction for git-repository
 type Repository interface {
 	Log(fromRev, toRev string) ([]Commit, error)
 	Commit(commitMessage string, paths ...string) error
+	SemVerTags() ([]SemVerTag, error)
 }
 
 type repo struct {
@@ -161,3 +165,38 @@ func newIterFn(commits *[]Commit, beginFn, endFn stopFn) func(c *object.Commit)
 		return nil
 	}
 }
+
+// Return SemVer tags from earliest to latest
+func (r *repo) SemVerTags() ([]SemVerTag, error) {
+	iter, err := r.gitRepo.Tags()
+	if err != nil {
+		return nil, err
+	}
+
+	versions := make([]*semver.Version, 0, defaultTagCount)
+
+	if err := iter.ForEach(func(r *plumbing.Reference) error {
+		version, err := semver.NewVersion(r.Name().Short())
+		if err != nil {
+			// Ignore bad tag
+			return nil
+		}
+
+		versions = append(versions, version)
+
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	sort.Sort(semver.Collection(versions))
+
+	tags := make([]SemVerTag, 0, len(versions))
+	for _, version := range versions {
+		tags = append(tags, SemVerTag{
+			Version: version,
+		})
+	}
+
+	return tags, nil
+}